Electric curling iron



March 12, 1940. J 305A 2,192,890

ELECTRIC CURLING IRON Filed Nov. 20, 1937 Patented Mar. l2, 1940 l L UNITED STATES' PATENT OFFICE Joseph Boda, Budapest, Hungary Appli-cation November 20, 1937, Serial No. 175,606 In Switzerland June 2, 1937 4 Claims. (Cl. 21S-24) My invention relates to improvements in elecout and, at the same time, waved. The skill tric curling irons in which the stationary arm of the hair dresser then brings about the desired operates in conjunction with the oscillating arm wave or curl in the hair. of the scissor-like device; and the objects of my This process alone, however, has not yielded 5 improvement are, rst, to provide a continuous the desired result, since an equal waving of the l and instantaneously controllable heating of both hair couldY not be obtained. arms; second, to aiord facilities for the proper The present invention relatesto a curling iron adjustment of both oscillating frequency and with which one is able, by means of the proper turning moment oi the said arm; and, third, mechanical and heat treatment, to obtain absol to provide means rendering the switching-on lutely equal waves in a very short time.

and switching-oir oi the motor adjustable and, In order to render it possible to switch oi the after this adjustment, however, automatic. motor revolving at an increasing speed and to The straight human hair possesses a circular switch it on with the full turning moment when cmsysection, and the curly hair a hat oval one. revolving at a decreasing speed, an adjustable Between these two forms there is a great number centrifugal controlis built into the curling iron ll of intermediate forms, i. e., the ,more or less which, in connection with'a switch, renders the wavy hair. In order, therefore, td put waves or switching on and oi of the motor adjustable and curls into the hair, it becomes necessary to change after this adjustment, however, automatic. the cross-sectional shape off/the hair, i. e., the If, now,l we select a lower frequency the volthair which is too circular 'ust be pressed into age of 'the motor circuit is, furthermore, so n an oval form. This ma be accomplished by changed that the motor starts with an increased the application of pressure, heat and moisture. torque. The devices' for controlling the fre- It is obvious that all these measures may be quency of the oscillations and those for adjustapplied at one and the same time or succesing the degree of heating,l nally, are mounted sively. The' application of pressure upon' the hair, in places easy of access so that the varying cong5 however, is indispensable; Additional heating iny diti'orxs when working with the curling iron at connection with moisture substantially facilitates any time may be taken into account. the work, i. e., less pressure and less ytime than The present curling iron also is especially is required for attaining the same final result. adapted to the fact that the human-hair, both Working with pressure and heat simultaneously as to thickness and strength, varies in wide 30 requires less eiort and allows one to do the work limits. For this reason all the operative funcquicker. The flattening of the hair also may tions also are adjustable, i. e., the degree of be speeded upvby using softeners, i.,e., aqueous heating, the frequency of the movable leg and alkaline solutions, when laying the curls. the pressure upon the legs. The frequency and Of late yet another process has been made heating lare mechanically adjustable, while the 35' known in which the cross-section of the hair is pressure upon the legs of the curling iron is mechanically flattened or rolled out by means adjustable in wide limits by the highly sensitive of a curling iron in which one leg oscillates raphand of the operator.

idly to and iro. The oscillations of ,this leg The above-mentioned objects are attained by take place with a relatively high frequency so the apparatus shown, by Way of an example, in

that the hair is treated 200 to 6000 times per the accompanying drawing, in whichminute. The operation is similar to that used Fig. 1 isalongitudinal section through the curlin bending metal parts, wherein a strip of sheet ing I'OD;

. iron, for example, is drawn through a device Fig. 2, a cross-section through the latter,

comprising a bottom part in the form of a l in' Fig. 1 refers to the roll-leg of the curling 45 stationary groove or mould and a top part in iron, 2 to the heating element of the said leg, 3 the form of a roll revolving .to and fro about to the trough-shaped second leg of the iron with its axis. According to the amount of pressure its heating element 4. The drive for the oscillatexerted by the roll on the strip and according ing leg l is inside the housing 5. The two hanto the speed with which the latter is drawn dles andl turn about the pin 8.- Afiexible shaft 50 through the device a more or less pronounced is contained within the handle 1 and. the metal curvature is imparted to the strip. Using in vhose 9. The said shaft transmits the revolutions place of the roller device a similarly built curlof the motor shaft l1 upon the drive of the leg l. ing iron and drawing a pencil of hair under In the housingl i6 there is the rotor I0 and the pressure through the iron the hair is ilattened` stator ll of the motor running in the bearings l2. liliv pose of adjusting the degree of heating of the two legs of the curling iron, and thisv adjustment is eected by means of the contact I4 and the setting knob I I. l

The adjustment of the frequency of oscillation of the leg I is accomplished by means of a centrifugal switch which opens a contact lying in the motor circuit at higher speeds of revolution. The contact I 0 of this latter device is stationary. When, the motor is not running the motor circuit is closed by means of a spring 2l. When the motor is running the weights 20 of the centrifugal control move away from each other, the movable contact I0 moves away from the said stationary contact Il and interrupts the motor circuit until the number of revolutions of the motor per minuw has decreased Ato such a point that the two contacts I8 and I! again approach and contact each other due to the drop of the centrifugal force and due to the tension of the said spring 2l. The speed of the motor may be adjusted from the outside by means of the spindle 2| and the screw 22. The latter also may serve, e.Y g., to so change the resistance in the motor circuit .that the motor is given a higher torque at a low number of revolutions. c

What I claim and desire to secure by Letters Patent is:

.1. An electric vibrating curling iron of the character described, comprising, in combination, a vibrating and a stationary leg pivoted to each other in scissor-like fashion, electrical heating 2,192,890 L., A controllable resistance I3 serves for the purelements foreach of said legs, an adjustable electrical resistance for controlling the heating of the said elements, a exible shaft in the handle of the said vibrating leg, an eccentric drive for said vibrating leg and disposed in said leg, an electric motor for operating the said shaft, and a centrifugal control for adjusting the frequency of vibration of the vibrating leg; and means for regulating the turning moment of the vibrating leg at low vibration frequencies.

2. An electrically operated vibrating curling iron according to claim 1, wherein said regulating means includes a resistance in the motor circuit, means for adjusting the said resistance, and

means co-operating with the' last-mentioned means for adjusting the speed of the motor; the whole in such a combination that the voltage of the motor circuit isA so changed in the course of an adjustment to a lower motor speed that the torque of the motor is increased.

3. An' electrically operated vibrating curling iron according to claim 1, including a contact in combination with the said adjustable centrifugal control for the purpose of switching of! the motor in the case of an increasing speed of the latter and of againswitching 1t on with the full turning moment in the case oi' a decreasing speed.

l4. An electrically operated vibrating curling' iron according to claiml wherein the control devices for adjusting the degree of heating and for adjusting the number of vibrations-are mounted in the cap of the motor.

JOSEPH BODA. 

